I think this may be because I linked an account, unlinked it, then nuked the mastodon instance and re-hosted it.
I currently get this screen when attempting to connect:
I know I’m replying to a very dated post here, but … I’m experiencing the same issue with oauth. What was your solution?
I’m following up on this in more detail in email. The problem is fixed now (cached information from Mastodon servers).
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I started my own instance and I’m currently experiencing this same thing with trying to authorize cross posting.